TerraN_EmpirE
Tyrant King
The Long answer.
What a keyhole is a bullet that has entered an object side on creating a key shaped hole.
It is a phenomenon where in a bullet has begun to tumble end over end as opposed to the normal spin stabilization of a bullet with the point cutting into the air. It’s the ballistic equivalent of a bellyflop.
This could happen for a number of reasons including the round having ricochet off an object, the round having lost velocity due to having passed through an object like a human body (see magic bullet) the round being damaged (again magic bullet) the round reaching the extreme of its effective range and loosing velocity or been fired with a lower than normal velocity for the round either by a very short barrel or under pressure load.
Because the round is tumbling as opposed to stable it will be inaccurate and farther is under drag meaning it is likely to loose velocity very quickly.
A wobbly barrel is highly unlikely to produce that tumble unless its wobble is enough that the barrel is probably falling out of the gun. I am not a ballistics specialist but the only way I could imagine such an effect being created with standard power ammunition would involve either a system like the ww2 Krummlauf or a ridiculously long barrel length. Most people just think longer barrel faster bullet but after a point the propellant is burned up and the rifling is now just inducing friction.
As the others have said the most likely suspect is specialized under powered training ammunition.
A wobbly hand guard might cause the shooter problems in getting a good position but it won’t cause ammunition to keyhole.
Bonus note A free floating barrel doesn’t actually make a rifle accurate it helps a little though.
I suspect that some uneducated sole has conflated Keymod with Key hole.
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